Improvement in trip-hammers



@OHN [KREHBIELO PATENTE 31119251871 TWP FUAMMERO NVENTQRO WsTNESSEISOJOHN KREHBIEL, OF VVILLIAMSVILLE, NEW YORK.

IMPROVEMENT IN TRIP-HAMMERS.

Specification forming part 0f Letters Patent No. 117 ,432, dated July25, 1871.

To all whom fit may concern:

Be it known that I, JOHN KREHBIEL, lVLD., of Williamsville, in thecounty of Erie and State of New York, have invented certain new anduseful Improvements in Trip-Hammers 5 and I do hereby declare that thefollowing is a full, clear, and exact description of the same, referencebeing had to the accompanying drawing and to the letters of referencemarked thereon making part of this specification, in which- Figure l isa front view. Fig. 2 is a side view. Fig. 3 is a reversed side view ofFig. 2. Fig. 4 is an enlarged view of the elevating-cam.

My improvement relates. chieiiy to that class of trip or power-hammersin which a spring is used to impart a quicker and smarter blow of thehammer on the anvil than can possibly be secured in the old style oftrip-hammers, where the entire power ofthe hammer depends on the weightand gravity of the same when released from the cam or other mechanismused to elevate it. My invention consists in securing above the spring acam or eccentric roller arranged in such relative position to the springthat through its movement the action of the spring is graduated and thestroke ofthe hammer regulated, or its power increased or diminished atpleasure.

This device is peculiarly adapted to the torsion-spring claimed inBenjamin Hersheys patent of February 2l, 1871, and can, consequently,bemost advantageously used in connection therewith.

To enable others skilled in the art to make and use my invention, I willnow proceed to describe its construction and operation.

The frame, to which is secured the entire mechanism, is constructed ofany suitable material and is of the ordinary style, consisting of avertical column or shaft, A, terminating in a curved arm, A. This arm Ais formed with the usual vertical face-plate a, which serves as abearing for the guides B B, between which travels the hammer B. Thishammer B is formed in one piece, and is such in general outline as isrepresented in Fig. 1. C is a cam, and is of the form shown in Fig. 4,and by reference to which it will be seen that while it slightly differsfrom the ordinary S-shaped cam it in its general character closelyresembles it. This cam G is secured on a shaft, c, which works insuitable journals or bearings secured on the frame. C is a drivingwheelon the outer end of this shaft c, through which the same is revolved,and which imparts the movement to the cam C that causes it, inconnection with the pin b, to elevate the hammer B. D is a spring of theclass known as the torsion, or in which the elasticity of' the metal isexerted through the twistin g or wrenching of the rod. This spring issecured on a suitable bearing, D', its lateral lever or turned-in arms dZ resting immediately above the upper face-plate of the hammer B.

Thus far in my description it will be observed that my device differsbut little from what is described and claimed in Hersheys patent, beforereferred to.

On the upper face of the plate a are secured two vertical arms oruprights, E E. To these arms is secured the shaft c that carries the camor eccentric roller E. F is a pawl-lever attached to the shaft e, and bymeans of which the roller E is revolved. F is a curved plate attached tothe frame c, and through the perforations in the same, acting asratchet-teeth, the lever F, by means of the pink, can be locked at anydesired oint.

p The operation of this eccentric roller E will be readily understood."When in the position shown in Figs. l and 3 it serves simply as arigidbearing, against which the spring is driven, the spring remaining in itsnormal condition except when in being elevated the, hammer is brought incontact with it. To increase the power o f the spring through the leverF, the roller E' is revolved so as to bring a different section of itseccentric surface in contact with the spring, and so on iuitil thatsection is reached which ismost distant from the shaft c, when thespring is in position to offer its greatest resistance, and, of course,when its greatest power will be exerted. However, between this positionand that show n in Figs. 1 and 3, and in which the roller Ef isrepresented as having that section of its surface which is nearest theshaft c immediately above the spring, it is easy to secure different andvarying degrees of pressure of the roller on the spring, whereby theoperator can graduate the action of the spring at pleasure.

G is a bearing-plate secured to the rear of the frame, and to which issecured the lever G', the same working on the pin or stump g as on apivotcenter. His a latch-pin, and is attached at right angles to thelever G by a hinged joint. This The spring D, cam or eccentric rollerE', plate latchpin H res ts in the aperture a ofthe frame F', andpaWl-lever F, When the same are so coma, and can at any time, when theaperture b in bined as to operate substantially as described. the hammerB is coincident With the aperture a', In testimony whereof I have signedmy name so enter the aperture b as to secure the hammer to thisspecification in the presence of tWo suband retain it in an elevatedposition. H is a scribing Witnesses.

spring, andserves to operate the latch-pin H au- JOHN KREHBIEL, M. D.

tomatically. The pin is Withdrawn at pleasure simply by moving the leverG. Witnesses:

Havingthusfullydescribedmyinvention,What P. F. ZENT,

I claim therein as new, and desire to secure by I). SAWTELL.

Letters Patent of the United States, is-

